Landlords, multi-family units? Here's the smart alternative to master keying. Weiser's Key Control Deadbolt, featuring SmartKey re-key technology, is a revolutionary cost and time-saving alternative to master keying. Re-keying a traditional master key system is labor intensive, time consuming and costly. With the first and only two-cylinder Key Control Deadbolt, either cylinder can be re-keyed in seconds, without removing the lock from the door. The top concealed cylinder provides one-key control for the property manager while the lower exposed cylinder allows unique user keys for the tenant. You can re-key your user or control cylinder at any time in seconds to maintain key control throughout tenant and employee turnover. Lets you retain your one-key access to all units and gain more flexible key management, all while saving time and money. The concealed key control cylinder has a unique patented keyway to provide increased security. Simply rotate the cylinder cap to expose the cylinder for use. This lockset is certified grade 2 ANSI/BHMA security bumpguard™.